Philips CDR775 - CD Module Playback

Faultfinding trees
GB 48 CDR7757.
Figure 7-6
CD MODULE PLAYBACK
PRESS <PLAY>
AUDIO?
• DAC 7309
⇒ TESTPOINTS 20, 21, 22 : I
2
S AT INPUT OF DAC 7309
⇒ CHECK POWER SUPPLY PINS 4, 13
⇒ CHECK CLK11 AT PIN 6 : 11.2896MHz
⇒ PIN 11 : MUTE HIGH?
⇒ TESTPOINTS 23, 24 : ANALOG OUTPUT?
⇒ REPLACE DAC 7309
• OPAMP 7120
⇒ TESTPOINTS 23, 24 : ANALOG OUTPUT?
⇒ POWER SUPPLY: PIN 8→12V
⇒ REPLACE OPAMP 7120
NO
YES
PLAYBACK CD
MODULE OK
DISTORTION?
NO
YES
NO
• DAC 7309
• OPAMP 7120
AUDIO
CD OUT PCB?
YES
• FLEX TO CDR MAINBOARD
• FLEX TO CD OUT BOARD
• CHECK I/O BOARD, CD OUT BOARD
CL 96532086_031.eps
080999